I did not see anything different in the slots I made versus the 16 hole boosters, I believe they are around .054 holes. The 1050 still has slotted boosters and comes in pretty quick. I plan on adjusting my IAB/IJ combo once I see the O2 logs, I think it needs to be a little shorter on the transition circuit duration. I still think the big issue is to make sure the boosters are not a restriction, the jet has to be.